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--- projects:xbr [2013/06/16 22:13] – [Abstract] mkucia
+++ projects:xbr [2013/06/19 10:47] – [Description] mkucia
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 ====== DIY Xbox 360 PC wireless receiver with MSP430 control ======
+//Germany 15.06.2013//
 ===== Abstract =====
 Xbox 360 wireless controller can be used with PC when special adapter is used.
@@ Line 5: / Line 6: @@
 Additional interface is used to initialize module LEDs and start sync process.
 One can create adapter for a fraction of cost using only several elements.
+{{:projects:xbr.jpg |}}
 ===== Description =====
-===== Example =====
+Required parts:
+  * Xbox360 RF board
+  * USB cable
+  * MCU
+  * LDO (3.3 [V])
+  * Capacitor/resistor for MCU
+Pinout of the RF board from top:
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+</html>
+Board must be powered by 3v3 so I decided to use LDO.
+Furthermore to start pairing process specific serial command must be sent. I have used MSP430G2231 for this task.
+MCU need reset pull-up resistor and decoupling capacitor.
+Pins 1 and 8 are connected to RF board.
+Pairing process starts few seconds after device is powered. No external button needed.
+<code=c>
+#include <msp430.h>
+#include <stdbool.h>
+#define DATA 1
+#define CLOCK 8
+#define DTA_INPUT P1DIR &= ~DATA;
+#define DTA_OUTPUT P1DIR |= DATA;
+#define DTA_HI P1OUT |= DATA;
+#define DTA_LO P1OUT &= ~DATA;
+volatile signed   short bit_counter	=0;
+volatile unsigned short command		=0;
+ //Port 1 interrupt service routine
+#pragma vector=PORT1_VECTOR
+__interrupt void Port_1(void)
+{
+ P1IFG &= ~CLOCK;
+ // are we sending or receiving?
+ if (bit_counter>0)
+ {
+	 DTA_OUTPUT
+	 if (command & (1<<(bit_counter-1)))
+		 DTA_HI
+	 else
+		 DTA_LO
+ }
+ // stop bit!
+ else if (bit_counter == 0)
+ {
+	 P1OUT |= DATA;
+	 command=0;
+ }
+ else
+ {
+	 DTA_INPUT
+	 if (P1IN&DATA)
+		 command |= (1<<((11+bit_counter)));
+	 else
+		 command &= ~(1<<((11+bit_counter)));
+ }
+ bit_counter--;
+}
+inline void send(char s)
+{
+	DTA_OUTPUT
+	command = s;
+	bit_counter = 10;
+	DTA_LO				// Send start bit
+}
+//------------------------------------------------------------------------------
+int main(void)
+{
+    unsigned short delay=0;
+    //
+    // CLOCK
+    //
+    WDTCTL = WDTPW | WDTHOLD;		// Stop watchdog timer
+    if (CALBC1_1MHZ==0xFF)		// If calibration constants erased
+    {
+      while(1);                     	// do not load, trap CPU!!
+    }
+    DCOCTL = 0;                     	// Select lowest DCOx and MODx settings
+    BCSCTL1 = CALBC1_1MHZ;
+    DCOCTL = CALDCO_1MHZ;
+    //
+    // Serial Interface
+    //
+    P1OUT |= DATA; 			// DTA HIGH
+    P1DIR |= (1<<6);
+    DTA_OUTPUT 				// DTA OUTPUT
+    P1IES |= CLOCK;			// fires on falling edge~
+    P1IFG &= ~CLOCK; 			// int cleared
+    P1IE |= CLOCK; 			// int enabled
+    //
+    // Start
+    //
+    __enable_interrupt();
+    __delay_cycles(2000000);
+    send(132);				// LEDs active with power button on
+    while(--delay);			// Delay for a while
+    send(0x085);			// Start animation
+    while(--delay);
+    while(--delay);
+    send(0x004);			// Start sync
+    __delay_cycles(5000000);		// Give some extra time to finish cmd send
+    __disable_interrupt();		// Turn off MCU
+    _BIS_SR(LPM4_bits);
+}
+</code>
+===== Notes =====
+  * There is no way to detect if controller is connected without snooping USB. Current and serial responses do not change after connection.
+  * RF board should be easy to get as repair shops have huge stock from broken Xboxs